#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2021/3/30 11:37
# @Author  : Crissu
# @Site    : 
# @File    : test3.py
# @Software: PyCharm
import os


# files = os.listdir("./operations")
# for i, item in enumerate(files):
#     print(i, item)
S = [1,2]

f = [-1] * len(S)
print(f)
